An extra solar planetary system with three Neptune-mass planets
Article Abstract:
A system of three Neptune-mass planets with periods of 8.67, 31.6, and 197 days, orbiting the nearby star HD 69830 is reported. Simulations show that the system is in a dynamically stable configuration and this star is already known to show an infrared excess possibly caused by an asteroid belt within 1 AU (the Sun-Earth distance).
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
User Contributions:
Comment about this article or add new information about this topic:
Recent ice-rich deposits formed at high latitudes on Mars by sublimation of unstable equatorial ice during low obliquity
Article Abstract:
Ice concentrations in high latitudes of both martian hemispheres were found by the Mars Odyssey spacecraft. Ice accumulation rates estimated from global climate model simulations show large variations of Mars obliquity that have allowed the formation of sedimentary layered deposits in high latitude and polar regions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
Mercury's capture into the 3/2 spin-orbit resonance as a result of its chaotic dynamics
Article Abstract:
Mercury rotates three times on its axis for every two orbits around the sun. It is due to the fact that Mercury is locked into a 3/2 spin-orbit resonance and the understanding of how this state initially arose is stated.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Rewiring cellular morphology pathways with synthetic guanine nucleotide exchange factors. Structural snapshots of the mechanism and inhibition of a guanine nucleotide exchange factor
- Abstracts: An asymptotic-giant-branch star in the progenitor system of a type la supernova. The massive binary companion star to the progenitor of supernova 1993J
- Abstracts: A breath of fresh air. Japanese call for more bite in animal rules
- Abstracts: Extrapair paternity and offspring immunocompetence in the reed bunting, Emberiza schoeniclus. Intense extrapair behaviour in a semicolonial passerine does not result in extrapair fertilizations
- Abstracts: Evolution of the continental crust. Metal saturation in the upper mantle